Existence is filled with happiness and suffering, but the amount of happiness

Existence is filled with happiness and suffering, but the amount of happiness

Existence is filled with happiness and suffering, but the amount of happiness and suffering is not guaranteed. Non-existence, on the other hand, has no happiness or suffering. Non-existence isn't good or bad, yet existence is labeled either good or bad. Why is it that existence must be labeled good or bad (or fulfilled/not fulfilled) with no middle ground, yet non-existence must remain neutral?

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